Empirical Studies on Traffic Flow in Inclement Weather
Figure 3.4. This figure presents four plots of field data and the model for both clear and 1-inch rain conditions on the following axes: speed-flow, speed-density, speed-headway, and flow-density. The figure also lists values for the following parameters, ordered by normal, inclement and F values: Free speed: 106 kilometers per hour, 95 kilometers per hour, 0.90; Capacity: 1888 vehicles per hour, 1550 vehicles per hour, 0.82; Speed-at-capacity: 90 kilometers per hour, 75 kilometers per hour, 0.83; Jam density: 100 vehicles per kilometer, 90 vehicles per kilometer, 0.90; and wave speed: -25.0 kilometers per hour, 24.3 kilometers per hour, 0.97.
